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Carman scanFor EMS PROfesor
1.6 Injector active signal analysis
1.6.1 Introduction of Injector and principle
Injector type
The fuel quantity is decided by the air flow and the injector opening time decides fuel
quantity. The injector open by electromagnetic power and close by spring force. Since
the electromagnetic power is depending on battery power, injector opening time is
compensated by battery power.
The principles of opening ( open by electromagnetic power and close by spring force )are
mostly same. But it is classified into orifice and pintle type by injection hole.
If the signal of crank angle sensor has the noise or broken signal, ECU stop the fuel
injection until it get normal signal of crank angle sensor.
Therefore, engine can be unstable or stall.